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Which of the following statement is incorrect with respect to pyrimidines?

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in Biology – Class 12 by (271k points)
Which of the following statement is incorrect with respect to pyrimidines?

(a) Heterocyclic

(b) 7 membered ring

(c) Cytosine is an example of pyrimidine

(d) Single-ring structure

The question was posed to me in semester exam.

Origin of the question is Molecular Basis of Inheritance topic in division Molecular Basis of Inheritance of Biology – Class 12

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Right option is (b) 7 membered ring

For explanation I would say: Pyrimidines are not 7 membered rings. Pyrimidines are a type of nitrogenous bases which are heterocyclic compounds with a 6 membered single-ring structure. Nitrogen is present at 1 and 3 positions of the rings. Examples of pyrimidines include thymine, uracil, and cytosine.

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